<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    div[class^="color-"] {
      width: 100%;
      height: 100px;
      margin: 10px;
    }

    .color-1 {
      background-color: #e6f0fc;
    }

    .color-2 {
      background-color: #e4f7ec;
    }

    .color-3 {
      background-color: #fdf2e4;
    }

    .color-4 {
      background-color: #fbebe8;
    }
  </style>
</head>

<body>
  <div class="color-1"></div>
  <div class="color-2"></div>
  <div class="color-3"></div>
  <div class="color-4"></div>
</body>

</html>